The Large Variable Magnetic Field of HD 126515 and its Implications for the Rigid-Rotator Model of Magnetic Stars
Abstract
The mean surface field H, of the Sr-Cr-Eu star HD 126515 varies approximately sinusoidally between 10 and 17 kilogauss in a period of 130d0. The effective field H, oscillates between -2 and +2 kilogauss with a single wave in the same period. From the point of view of the rigid-rotator model, these results require that the star have a hemispherically asymmetric magnetic field, the principal features of which are represented by a dipole displaced from the center of the star in the direction opposite to its moment by 0.36 stellar radii. HD 126515 is also a spectrum variable, and the phase relations between the line intensity and H, variations indicate in a general way that the heavy elements are concentrated in regions where the surface field is strongest.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 1970
- DOI:
- 10.1086/150493
- Bibcode:
- 1970ApJ...160.1059P